Hello everyone! I read a few posts and I see I'm not the only one surprised to hear they're not alone. Cool! Also glad to hear about the fella who's 60 and has been cracking since 12. Glad to hear I'll be typing for a long time still.
I started cracking around 9 with knuckles, and of course I don't mean the way most people crack their knuckles. New joints started to crack until I was 17. Over the years the way joints crack has changed for the better, far less annoying than it used to be. If you want to know more just ask.
Ok the fun part..
Joints that are able to crack continuously (no "gas build up" theory can explain this):
Knuckles
Both wrists
Right shoulder
Both ankles
The rest:
Jaw
Neck
Back, Spine (twisting, pushing back, fist at the base)
Sternum
Elbows
Whatever joints connect your legs to the rest of you
Right knee
Toes
and a mysterious shin pop I can get sometimes
That's all.. and I'm really glad ya'll are out there.